Upgrading of encryption

• US 20040049688A1
• Filed: 11/13/2002
• Published: 03/11/2004
• Est. Priority Date: 06/06/2001
• Status: Active Grant

• Current Assignee: Brant L. Candelore, Henry Derovanessian
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Candelore, Brant L., Derovanessian, Henry
• Granted Patent: US 7,350,082 B2
• Time in Patent Office: Days
• US Class Current: 713/191
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/238 Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams hybrid fiber coaxial [HFC] networks for downstream channel allocation for video distribution H04L12/2801; flow control in packet networks H04L47/10; real-time communication protocols in data switching networks H04L65/00; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43607 Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
• CPC Class Codes: H04N 21/440245 the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
• CPC Class Codes: H04N 21/440281 by altering the temporal resolution, e.g. by frame skipping television signal recording using magnetic recording on tape for reproducing at a rate different from the recording rate H04N5/783
• CPC Class Codes: H04N 21/44055 by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 7/163 by receiver means only
• CPC Class Codes: H04N 7/165 Centralised control of user terminal subsequent to an upstream request signal H04N7/17345; Registering at central by two-way working H04N7/17309
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58
• CPC Class Codes: H04N 9/7925 for more than one standard

Abstract

A method of upgrading an encryption process for encryption of video information from an old encryption process to a new encryption process, consistent with certain embodiments involves selecting a portion of video content for selective encryption. The selected portion is duplicated to produce first and second copies of the selected portion. The first copy is encrypted using the old encryption process and the second copy is encrypted using the new encryption process to produce a dual partially encrypted segment of video information that can either be broadcast over a cable or satellite system or stored in a package medium as two program chains.

Claims

1. A method of providing an upgrade for encryption used to encrypt video content stored in a Digital Versatile Disc (DVD) from an old encryption process to a new encryption process, comprising:

selecting a portion of video content for dual partial encryption;

dual partial encrypting the video content so that the video content has a clear portion, a portion encrypted using the old encryption process and a portion encrypted using the new encryption process;

storing the dual partial encrypted video content on the DVD so that a first program chain references the clear portion and the portion encrypted using the old encryption process, and so that a second program chain references the clear portion and the portion encrypted using the new encryption process.

2. The method according to claim 1, wherein the selected portion comprises a collection of video object units.

3. The method according to claim 1, wherein the portion encrypted using the old encryption process and the portion encoded using the new encryption process are stored on the DVD using interleaved blocks.

4. The method according to claim 1, wherein the old encryption process comprises a process that uses the Content Scrambling Algorithm (CSS).

5. A method of providing an upgrade for encryption used for encryption of video content stored in package medium from an old encryption process to a new encryption process, comprising:

selecting a portion of video content for selective encryption;

duplicating the, selected portion of content to produce first and second copies of the selected portion;

encrypting the first copy of the selected portion using the old encryption process;

encrypting the second copy of the selected portion using the new encryption process;

storing the portion of the video content which is not selected as clear content on the package medium;

storing the encrypted first copy and the encrypted second copy of the selected portion on the package medium.

6. The method according to claim 5, wherein the package medium comprises a DVD.

7. The method according to claim 5, wherein the old encryption process comprises a process that uses the Content Scrambling Algorithm (CSS).

8. The method according to claim 5, wherein the clear content and the encrypted first copy are stored as a first program chain and wherein the clear content and the encrypted second copy are stored as a second program chain.

9. A method of playback of content stored on a recording medium, comprising:

reading a portion of the recording medium to determine that the recording medium contains content containing portions encrypted under multiple encryption techniques;

selecting content having portions encrypted under one of the multiple encryption techniques; and

playing the content, wherein the playing comprises decrypting the encrypted portion of the content.

10. The method according to claim 9, wherein the multiple encryption techniques comprise a legacy encryption technique and an encryption technique to be used as a replacement for the legacy encryption technique.

11. The method according to claim 10, wherein the selected content has portions encrypted under the replacement for the legacy encryption technique.

12. The method according to claim 11, wherein the selecting comprises selecting a program chain containing the portions encrypted under the replacement for the legacy encryption technique.

13. The method according to claim 10, wherein the selected content has portions encrypted under the legacy encryption technique.

14. The method according to claim 13, wherein the selecting comprises selecting a program chain containing the portions encrypted under the legacy encryption technique.

15. A selectively encrypted digital video signal embodied in an electronic recording medium, comprising:

a sequence of packets of video data, wherein the sequence of packets when not encrypted represent a segment of video content;

wherein certain of the packets are dual encrypted using a legacy encryption method and a replacement encryption method; and

a segment of code that identifies the packets encrypted using the legacy encryption method and the packets encrypted using the replacement encryption method as separate program chains.

16. The selectively encrypted digital video signal according to claim 15, wherein the packets comprise video object units.

17. A method of providing an upgrade for encryption used for encryption of video content for electronic distribution by a content provider from an old encryption process to a new encryption process, comprising:

selecting a portion of video content for dual partial encryption;

dual partial encrypting the video content so that the video content has a clear portion, a portion encrypted using the old encryption process and a portion encrypted using the new encryption process;

transmitting the dual partial encrypted video content over a broadcast medium.

18. The method according to claim 17, wherein the broadcast medium comprises one of a cable and a satellite network.

19. The method according to claim 17, further comprising assigning program identifiers (PIDs) to distinguish between the portions encrypted using the old encryption process and the portion encrypted under the new encryption process.

20. The method according to claim 17, wherein the old encryption process comprises a data encryption standard (DES) encryption process.

21. The method according to claim 17, wherein the new encryption process comprises one of Triple DES, Advanced Encryption Standard (AES) and Common Scrambling Algorithm (CSA)

22. A method of decoding a stream of packets containing electronically distributed video content from a content provider, wherein the content is dual partially encrypted using an old encryption process and a new encryption process, comprising:

receiving the stream of dual partially encrypted video content;

discarding packets encrypted by the old encryption process;

decrypting packets encrypted by the new encryption process; and

combining the decrypted packets with unencrypted packets to create a clear stream of packets for decoding.

23. The method according to claim 22, wherein the stream of dual partially encrypted video content is received over one of a cable network and a satellite network.

24. The method according to claim 22, wherein program identifiers (PIDs) are used to distinguish between the portions encrypted using the old encryption process and the portion encrypted under the new encryption process, and wherein the discarding comprises discarding packets identified by the PID associated with the old encryption process.

25. The method according to claim 22, wherein the old encryption process comprises a data encryption standard (DES) encryption process.

26. The method according to claim 22, wherein the new encryption process comprises one of Triple DES, Advanced Encryption Standard (AES) and Common Scrambling Algorithm (CSA).

27. A selectively encrypted digital video signal embodied in a carrier wave, comprising:

a stream of packets of video data, wherein the stream of packets when not encrypted represent a segment of video content;

certain of the packets being unencrypted and certain of the packets being encrypted under a legacy encryption method and certain of the packets being encrypted under a replacement encryption method;

a first segment of code that identifies the unencrypted packets by a first packet identifier (PID); and

a second segment of code that identifies the encrypted packets by a second packet identifier (PID).

28. The method according to claim 27, wherein the carrier wave is broadcast using one of a cable network and a satellite network.

29. The method according to claim 27, wherein the legacy encryption process comprises a data encryption standard (DES) encryption process.

30. The method according to claim 27, wherein the replacement encryption process comprises one of Triple DES, Advanced Encryption Standard (AES) and Common Scrambling Algorithm (CSA).

31. A method of upgrading an encryption process for encryption of video information from an old encryption process to a new encryption process, comprising:

selecting a portion of video content for selective encryption;

duplicating the selected portion of content to produce first and second copies of the selected portion;

encrypting the first copy of the selected portion using the old encryption process; and

encrypting the second copy of the selected portion using the new encryption process.

32. The method according to claim 31, further comprising transmitting the encrypted first copy and encrypted second copy along with unselected portions of the video content over one of a cable network and a satellite network.

33. The method according to claim 31, further comprising distinguishing between the portions encrypted using the old encryption process and the portion encrypted under the new encryption process by assigning distinctive program identifiers (PIDs) to each.

34. The method according to claim 31, wherein the old encryption process comprises a data encryption standard (DES) encryption process.

35. The method according to claim 31, wherein the new encryption process comprises one of Triple DES, Advanced Encryption Standard (AES) and Common Scrambling Algorithm (CSA).

36. The method according to claim 31, further comprising storing the encrypted first copy and encrypted second copy along with unselected portions of the video content a digital versatile disc DVD.

37. The method according to claim 36, wherein the old encryption process comprises a process that uses the Content Scrambling Algorithm (CSS).

38. The method according to claim 36, wherein the unselected portion and the encrypted first copy are stored as a first program chain and wherein the unselected portion and the encrypted second copy are stored as a second program chain.